radium F
Polonium Po*lo"ni*um (p[-o]*l[=o]"n[i^]*[u^]m), n. [NL. So named after Poland, in L. form Polonia, one of the discoverers being a Pole.] (Chem.) A radioactive chemical element, discovered by M. and MMe. Curie in pitchblende, and originally called {radium F}. It has atomic number 84 and an atomic weight of 210. It is a very rare natural element, having an abundance in uranium ores only 0.2% that of radium. It is closely related chemically to bismuth. It emits only alpha rays, and has a half-life of 138 days. It is thus more unstable than radium, and a milligram of polonium emits as many alpha particles as 5 grams of radium. Twenty-seven isotopes are known, with atomic masses from 192 to 218. At present a more practical method of preparation than isolation from ores is the preparation by neutron bombardment of bismuth in a nuclear reactor, and it may be obtained commercially by users having an appropriate permit. --[HBCF61] [Webster 1913 Suppl. +PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • radium F — Chem. an isotope of polonium: polonium 210. [1900 05] * * * radium F, = polonium. (Cf. ↑polonium) …   Useful english dictionary

  • radium F — Chem. an isotope of polonium: polonium 210. [1900 05] * * * …   Universalium

  • RADIUM — En 1898, quelques mois après avoir découvert le polonium, Pierre et Marie Curie et leur collaborateur Gustave Bémont, poursuivant l’étude du fractionnement de la pechblende de Joachimsthal (aujourd’hui Jáchymov, en République tchèque), purent… …   Encyclopédie Universelle

  • radium B — Chem. an isotope of lead, formed by decay of radium A, that gives rise to radium C, which is an isotope of bismuth, from which radium D, radium E, and radium F, or polonium 210, are derived. [1900 05] * * * …   Universalium

  • radium B — /reɪdiəm ˈbi/ (say raydeeuhm bee) noun an isotope of lead, formed from radium A by disintegration, which gives rise to an isotope of bismuth called radium C, from which radium D, radium E, and radium F (polonium) are derived …   Australian English dictionary

  • radium B — Chem. an isotope of lead, formed by decay of radium A, that gives rise to radium C, which is an isotope of bismuth, from which radium D, radium E, and radium F, or polonium 210, are derived. [1900 05] …   Useful english dictionary

  • Radium Hill — Minengelände im Jahr 1954 Abbau von Uranerz, Davidit, Carnotit Abbautechnik …   Deutsch Wikipedia

  • Radium chloride — Identifiers CAS number 10025 66 8  …   Wikipedia

  • Radium Hot Springs, British Columbia — Infobox Settlement official name = Village of Radium Hot Springs other name = native name = nickname = settlement type = Village motto = imagesize = image caption = flag size = image seal size = image shield = Radium coa.jpg shield size = city… …   Wikipedia

  • Radium — Pour les articles homonymes, voir Radium (homonymie). Radium Francium ← Radium → …   Wikipédia en Français

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